Your browser does not fully support modern features. Please upgrade for a smoother experience.
Subject:
All Disciplines Arts & Humanities Biology & Life Sciences Business & Economics Chemistry & Materials Science Computer Science & Mathematics Engineering Environmental & Earth Sciences Medicine & Pharmacology Physical Sciences Public Health & Healthcare Social Sciences
Sort by:
Most Viewed Latest Alphabetical (A-Z) Alphabetical (Z-A)
Filter:
All Topic Review Biography Peer Reviewed Entry Video Entry
Topic Review
Panama Papers (Africa)
The Panama Papers are 11.5 million leaked documents that detail financial and attorney–client information for more than 214,488 offshore entities. The documents, some dating back to the 1970s, were created by, and taken from, Panamanian law firm and corporate service provider Mossack Fonseca, and were leaked in 2015 by an anonymous source. This page details related allegations, reactions, and investigations, in Africa. Former South African president Thabo Mbeki, head of the African Union's panel on illicit financial flows, on April 9 called the leak "most welcome" and called on African nations to investigate the citizens of their nations who appear in the papers. His panel's 2015 report found that Africa loses $50 billion a year due to tax evasion and other illicit practices and its 50-year losses top a trillion dollars. Furthermore, he said, the Seychelles, an African nation, is the fourth most mentioned tax haven in the documents.
  • 2.6K
  • 25 Nov 2022
Topic Review
Basic Principles and Operation Modes of AFM
Atomic force microscopy (AFM) is a method that provides the nanometer-resolution three-dimensional imaging of living cells in their native state in their natural physiological environment. AFM is a versatile tool for the high-resolution three-dimensional imaging, nanomechanical characterization and measurement of inter- and intramolecular forces in living and non-living structures. The AFM probe, which has a nm-sized tip, measures the interatomic forces between the sample surface and the tip apex. Sample preparation for AFM measurements is simple, and there is no need for the freezing, metal coating or staining of the sample. As a result, there is little-to-no damage to the sample, and the functions of biological systems can be preserved. AFM works in both air and liquids; so, physiological buffers and growth media can be used to study living cells. The high resolution of AFM allows the imaging of atoms on hard surfaces and molecules on soft biological samples.
  • 2.6K
  • 12 Jun 2023
Topic Review
Exercise with Green Tea Consumption Improve Sports Performance
Regular exercise is fundamental for maintaining a healthy lifestyle. 
  • 2.6K
  • 10 Jan 2022
Topic Review
Dual-Purpose Crops
Competition over land between food and fodder production, along with recurrent droughts and increasing population, has put mixed crop–livestock farming systems in the drylands of sub-Saharan Africa under pressure. Dual-purpose crops hold huge potential to ease this pressure and simultaneously improve food and fodder availability in these systems.
  • 2.6K
  • 25 May 2021
Topic Review
Development of Ultra-High-Performance Concrete
Ultra-high-performance concrete (UHPC) is a form of cementitious composite that has been the most innovative product in concrete technology. Ultra-high-performance concrete has been broadly employed for the design of numerous forms of construction owing to its excellent mechanical characteristics and durability. 
  • 2.6K
  • 08 Feb 2023
Topic Review
Reinforcement (Speciation)
Reinforcement is a process of speciation where natural selection increases the reproductive isolation (further divided to pre-zygotic isolation and post-zygotic isolation) between two populations of species. This occurs as a result of selection acting against the production of hybrid individuals of low fitness. The idea was originally developed by Alfred Russel Wallace and is sometimes referred to as the Wallace effect. The modern concept of reinforcement originates from Theodosius Dobzhansky. He envisioned a species separated allopatrically, where during secondary contact the two populations mate, producing hybrids with lower fitness. Natural selection results from the hybrid's inability to produce viable offspring; thus members of one species who do not mate with members of the other have greater reproductive success. This favors the evolution of greater prezygotic isolation (differences in behavior or biology that inhibit formation of hybrid zygotes). Reinforcement is one of the few cases in which selection can favor an increase in prezygotic isolation, influencing the process of speciation directly. This aspect has been particularly appealing among evolutionary biologists. The support for reinforcement has fluctuated since its inception, and terminological confusion and differences in usage over history have led to multiple meanings and complications. Various objections have been raised by evolutionary biologists as to the plausibility of its occurrence. Since the 1990s, data from theory, experiments, and nature have overcome many of the past objections, rendering reinforcement widely accepted,:354 though its prevalence in nature remains unknown. Numerous models have been developed to understand its operation in nature, most relying on several facets: genetics, population structures, influences of selection, and mating behaviors. Empirical support for reinforcement exists, both in the laboratory and in nature. Documented examples are found in a wide range of organisms: both vertebrates and invertebrates, fungi, and plants. The secondary contact of originally separated incipient species (the initial stage of speciation) is increasing due to human activities such as the introduction of invasive species or the modification of natural habitats. This has implications for measures of biodiversity and may become more relevant in the future.
  • 2.6K
  • 28 Apr 2023
Topic Review
Effectiveness of Riboflavin on Migraine
Riboflavin (vitamin B2) is an essential water-soluble vitamin that helps prevent various medical conditions, such as sepsis, ischemia, and some cancers. Riboflavin’s biological effects, including antioxidant, anti-aging, anti-inflammatory, and anti-nociceptive effects, have been extensively studied. The pathophysiology of migraines is linked to oxidative stress with mitochondrial dysfunction, and neuroinflammation by the glial cell network.
  • 2.6K
  • 05 Aug 2021
Topic Review
Natural Ventilation
Natural ventilation is the process of supplying air to and removing air from an indoor space without using mechanical systems. It refers to the flow of external air to an indoor space as a result of pressure differences arising from natural forces. There are two types of natural ventilation occurring in buildings: wind driven ventilation and buoyancy-driven ventilation. Wind driven ventilation arises from the different pressures created by wind around a building or structure, and openings being formed on the perimeter which then permit flow through the building. Buoyancy-driven ventilation occurs as a result of the directional buoyancy force that results from temperature differences between the interior and exterior. Since the internal heat gains which create temperature differences between the interior and exterior are created by natural processes, including the heat from people, and wind effects are variable, naturally ventilated buildings are sometimes called "breathing buildings".
  • 2.6K
  • 25 Oct 2022
Topic Review
Cellulose Derivatives-Based Dressings for Wound-Healing Management
Notwithstanding the progress regarding wound-healing management, the treatment of the majority of skin lesions still represents a serious challenge for biomedical and pharmaceutical industries. Thus, the attention of the researchers has turned to the development of novel materials based on cellulose derivatives. Cellulose derivatives are semi-synthetic biopolymers, which exhibit high solubility in water and represent an advantageous alternative to water-insoluble cellulose. These biopolymers possess excellent properties, such as biocompatibility, biodegradability, sustainability, non-toxicity, non-immunogenicity, thermo-gelling behavior, mechanical strength, abundance, low costs, antibacterial effect, and high hydrophilicity. They have an efficient ability to absorb and retain a large quantity of wound exudates in the interstitial sites of their networks and can maintain optimal local moisture. Cellulose derivatives also represent a proper scaffold to incorporate various bioactive agents with beneficial therapeutic effects on skin tissue restoration. Due to these suitable and versatile characteristics, cellulose derivatives are attractive and captivating materials for the development of multiple biomedical and pharmaceutical applications, such as wound dressings, drug delivery devices, and tissue engineering.
  • 2.6K
  • 29 Mar 2022
Topic Review
Public Sector Downsizing and Public Sector Performance
Performance measurement as a social structure considers that institutional rules arise from the interaction of individual reactions. The capability of a country’s public sector to provide high-quality goods and services cost-effectively is crucial to foster long-term growth. Governments attempt to identify the most effective production processes to increase efficiency, effectiveness, and performance. On the other hand, performance can be considered a combination of effectiveness and efficiency in the public and private sectors. Public sector performance is considered through its indicators at the international level across countries. A public sector’s goods and services can be efficient in volume and quality, with good corporate performance.
  • 2.6K
  • 24 Mar 2022
Topic Review
Extraction of Protein from Agricultural Waste
Protein is the link of amino acids bonded by peptide bonds forming the primary, secondary, tertiary, and quaternary structure of the protein. Regardless of the superiority of the protein quantity in animals compared to plants, plant-derived protein has become one of the alternative options in overcoming the increasing environmental issue due to the mass production in the agricultural sector. Plant-derived protein is now receiving attention for its functionality as a sustainable protein source. In recent years, downstream bioprocessing industries are venturing into less tedious, simple, and high-efficiency separation by implementing advanced purification and extraction methods. The separation of proteins, with the main focus on amylase as an enzyme from industrial agriculture waste using various techniques of extraction, is being discussed further.
  • 2.6K
  • 01 Dec 2021
Topic Review
Perylene Diimide Bioconjugates
Perylene diimide (PDI) has attracted attention owing to its chemical robustness, thermal and photo-stability, and outstanding optical and electronic properties.
  • 2.6K
  • 18 Feb 2023
Topic Review
Innovation Capability and Strategic Agility
  Strategic Agility and Innovation Capability 1.      Definition  Due to the nature of business environments as volatile and unforecastable, organizations are required to have appropriate capabilities such as strategic agility and innovation capability [1-4]. Strategic agility encompasses organization ability to sense and adapt to changes in the work environment and add value to its customer in combination of leadership support. On the other hand, innovation capability as the ability to produce novel products based on novel processes [5] is very critical for organizations. Despite the results on the effect of strategic agility on innovation capability [6-10], there is a little knowledge on the effect of former construct on the later one in the Middle East business environment, particularly in Jordan. Therefore, this study aimed at investigating the impact of strategic agility on innovation capability.
  • 2.6K
  • 04 Aug 2021
Topic Review
Amyloidosis in Alzheimer’s Disease
Amyloidosis is a clinical and pathological condition in which amyloid accumulates in various organs and cells of the body, forming amyloid plaques for complex reasons, leading to organ dysfunction. It can be hereditary or acquired. Depending on the location of amyloid fibers’ deposition, amyloidosis is divided into two groups, one is localized amyloidosis, that occurs in a specific area of a single tissue, and the other is systemic amyloidosis, which occurs throughout the body. Amyloid plaques are made up of amyloid proteins. Amyloid β peptide (Aβ) is the main component that plays a significant role in the pathogenesis of AD and is considered to be the leading cause of Alzheimer’s disease (AD) development.
  • 2.6K
  • 21 Feb 2022
Topic Review
Java Persistence API
The Java Persistence API (JPA), in 2019 renamed to Jakarta Persistence, is a Java application programming interface specification that describes the management of relational data in applications using Java Platform, Standard Edition and Java Platform, Enterprise Edition/Jakarta EE. Persistence in this context covers three areas: The reference implementation for JPA is EclipseLink.
  • 2.6K
  • 14 Oct 2022
Topic Review
Principles of Grid Generation
Grids or meshes are geometrical shapes (formed after discretisation of the geometric domain) which are small-sized discrete cells that cover the physical domain, whose objective is to identify the discrete volumes or elements where conservation laws can be applied. They have applications in the fields of computational fluid dynamics (CFD), geography, designing and many more places where numerical solutions to the partial differential equations (PDEs) are required. Numerical grid generation is the crucial initial step involved in computing numerical solutions to the equations that describe a physical process. The accuracy of the solution depends upon the quality of the grid generated. A well-constructed grid can improve the quality of solution whereas, deviations from the numerical solution can be observed with a poorly constructed grid. Techniques for creating the cell forms the basis of grid generation. Various methods for the grid generation are discussed below.
  • 2.6K
  • 28 Oct 2022
Topic Review
Internet of Wearable Things
The Internet of Wearable Things (IoWT) aims to improve people’s quality of daily life. It involves sensors fitted into wearable devices, monitoring the individual’s activity, health factors, and other things. 
  • 2.6K
  • 15 Nov 2022
Topic Review
5-Hydroxymethylfurfural (HMF)
HMF, an indispensable member of the furan-based platform compound, known as the “sleeping giant”, is a bridge between renewable biomass and industrial bulk chemicals. In recent years, the catalytic transformation of biomass to HMF has been widely studied and envisaged to be hopeful in achieving sustainable biorefineries. The synthesis of HMF from biomass requires the acid hydrolysis of biomass to hexose, and then dehydration of hexose, to obtain HMF. In the second step of dehydration, starting from ketohexose (fructose) is more efficient than starting from aldohexose (glucose).
  • 2.6K
  • 11 Oct 2021
Topic Review
Balancing Immune System to Treat Rheumatoid Arthritis
Rheumatoid arthritis (RA) and other autoimmune inflammatory diseases are examples of imbalances within the immune system (disrupted homeostasis) that arise from the effects of an accumulation of environmental and habitual insults over a lifetime, combined with genetic predispositions. The Ligand Epitope Antigen Presentation System (LEAPS) therapies are capable of inhibiting ongoing disease progression in animal models. Whereas DMARDs ablate or inhibit specific proinflammatory cytokines or cells and JAK inhibitors (jakinibs) inhibit the receptor activation cascade for expression of proinflammatory cytokines, the LEAPS therapeutic vaccines specifically modulate the ongoing antigen-specific, disease-driving, proinflammatory T memory cell responses. This decreases disease presentation and changes the cytokine conversation to decrease the expression of inflammatory cytokines while increasing the expression of regulatory cytokines. 
  • 2.6K
  • 09 May 2022
Topic Review
Siloxanes
Siloxanes are adaptable species that have found extensive applications as versatile materials for functionalising various surfaces and as building blocks for polymers and hybrid organic-inorganic systems. The primary goal of this review is to report on and briefly explain the most relevant recent developments related to siloxanes and their applications, particularly regarding surface modification and the synthesis of graft copolymers bearing siloxane or polysiloxane segments. The key strategies for both functionalisation and synthesis of siloxane-bearing polymers are highlighted, and the various trends in the development of siloxane-based materials and the intended directions of their applications are explored.
  • 2.6K
  • 08 Sep 2020
  • Page
  • of
  • 2727
Featured Entry Collections
>>

Featured Reprints

>>
Encyclopedia of Digital Society, Industry 5.0 and Smart City
Encyclopedia of Engineering
Encyclopedia of Social Sciences
Encyclopedia of Medieval Royal Iconography
Academic Video Service
Feedback